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/*
* (C) 2014 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include "apps.h"
#include <botan/entropy_src.h>
#include <botan/auto_rng.h>
#if defined(BOTAN_HAS_SYSTEM_RNG)
#include <botan/system_rng.h>
#endif
namespace {
int rng(const std::vector<std::string> &args)
{
if(args.size() < 2 || args.size() > 3)
{
std::cout << "Usage: " << args[0] << " [--raw-entropy] n\n"
<< "n: number of bytes"
<< std::endl;
return 1;
}
try
{
const size_t bytes_count = to_u32bit(args.back());
const bool raw = (args.size() == 3 && args[1] == "--raw-entropy");
#if defined(BOTAN_HAS_SYSTEM_RNG)
std::cout << "System " << hex_encode(system_rng().random_vec(bytes_count)) << std::endl;
#endif
if(!raw)
{
AutoSeeded_RNG rng;
std::cout << hex_encode(rng.random_vec(bytes_count)) << std::endl;
}
else
{
double total_collected = 0;
Entropy_Accumulator accum(
[bytes_count,&total_collected](const byte in[], size_t in_len, double entropy_estimate)
{
std::cout << "Collected estimated "<< entropy_estimate << " bits in "
<< hex_encode(in, in_len) << std::endl;
total_collected += entropy_estimate;
return total_collected >= bytes_count;
});
Entropy_Sources::global_sources().poll(accum);
}
}
catch(std::exception& e)
{
std::cout << "Error: " << e.what() << std::endl;
return 1;
}
return 0;
}
REGISTER_APP(rng);
}
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